Extrusion Technology for Large Diameter Polyolefin Pipes [PE]

This Paper sums up the possibilities of cost reduction, especially for large diameter pipes, by automation of the extrusion line. Beneath the overall cost structure, steps such as gravimetric feed, constant meterweight control, mechanical or thermal centering and data acquisition are discussed. It is pointed out where a thermal die centering makes sense and where the mechanical solution seems to be more useful. Last but not least, a complete concept of automation is presented.
Developments in the conception and fabrication of extrusion lines must be directed primarily toward reduction overheads for the processor. In other words, when modern production facilities are used the costs per product are normally significantly lower than when conventional plant is employed. This can only be viewed as being in the best interests of both plant manufacturer and processor for ultimately a fabrication line will be replaced less for reasons of wear and tear and obsolescence than for reasons of economic efficiency and improved quality in the finished product.